[OE-core] Valgrind : Unhanded instructions mfatbu and mfatbl

[Bansal Aneesh-B39320]

Hello,

PowerPC uses two alternate time base registers which are read from user space
by using PPC instructions mfatbu and mfatbl . However these instructions are
not supported by Valgrind.
CPU : e500mc
Here are the logs when an application executing such instruction is executed
with Valgrind 3.7.0:

dis_proc_ctl(ppc)(mfspr,SPR)(0x20F)
disInstr(ppc): unhandled instruction: 0x7C0F82A6
                 primary 31(0x1F), secondary 678(0x2A6)
==2204== valgrind: Unrecognized instruction at address 0x10003dfc.
==2204==    at 0x10003DFC: ??? (in /usr/bin/simple_crypto)
==2204==    by 0x1000181B: ??? (in /usr/bin/simple_crypto)
==2204==    by 0xFE179E7: ??? (in /lib/libpthread-2.13.so)
==2204==    by 0x40EEA9B: ??? (in /lib/libc-2.13.so)
==2204== Your program just tried to execute an instruction that Valgrind
==2204== did not recognise.  There are two possible reasons for this.
==2204== 1. Your program has a bug and erroneously jumped to a non-code
==2204==    location.  If you are running Memcheck and you just saw a
==2204==    warning about a bad jump, it's probably your program's fault.
==2204== 2. The instruction is legitimate but Valgrind doesn't handle it,
==2204==    i.e. it's Valgrind's fault.  If you think this is the case or
==2204==    you are not sure, please let us know and we'll try to fix it.
==2204== Either way, Valgrind will now raise a SIGILL signal which will
==2204== probably kill your program.


We have developed a patch to fix the issue and submitted the patch upstream to Valgrind community for processing.


Regards,
Aneesh Bansal
[cid:image001.jpg at 01CCD1E4.693FCF80]
Plot No. - 18 | Sector-16 A, Noida - 201301
Phone  : 0120395 x3320

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